classes, better debugging and spritesheets

classes.lua

@@ -1,4 +1,27 @@
 
+local function newImage(path, alphaColor)
+    if (not alphaColor) then
+        return love.graphics.newImage(path)
+    end
+
+	local imageData = love.image.newImageData(path)
+
+	imageData:mapPixel(function(x, y, r, g, b, a)
+        if (r == alphaColor.r and
+            g == alphaColor.g and
+            b == alphaColor.b and
+            a == alphaColor.a) then
+            return 0, 0, 0, 0
+        end
+
+		return r, g, b, a
+	end)
+
+    local image = love.graphics.newImage(imageData)
+
+    return image
+end
+
 --[[
     Sprite Class
     This is essentially just a Wrapper for LÖVEs Image
@@ -7,10 +30,10 @@
 Sprite = {}
 Sprite.__index = Sprite
 
-function Sprite.new(path)
+function Sprite.new(path, alphaColor)
     local self = setmetatable({}, Sprite)
 
-    self.image = love.graphics.newImage(path)
+    self.image = newImage(path, alphaColor)
 
     return self
 end
@@ -21,41 +44,150 @@ end
 
 
 --[[
-    Audio Class
+    Spritesheet Class
+    This is essentially just a Wrapper for LÖVEs Image, specifically made for Spritesheets
+]]--
+
+Spritesheet = {}
+Spritesheet.__index = Spritesheet
+
+function Spritesheet.new(path, width, height, alphaColor)
+    local self = setmetatable({}, Spritesheet)
+
+    self.sprites = {}
+
+    if (string.find(path, ".json")) then
+        local contents, size = love.filesystem.read(path)
+        local sliceData = json.decode(contents)
+
+        print("games/" .. sliceData.image)
+        self.image = newImage("games/" .. sliceData.image, alphaColor)
+
+        -- Create the slices according to the sliceData
+        local imageWidth, imageHeight = self.image:getWidth(), self.image:getHeight()
+
+        local counter = 0
+        for _, data in pairs(sliceData) do
+            table.insert(self.sprites, love.graphics.newQuad(
+                data.x,
+                data.y,
+                data.width,
+                data.height,
+                imageWidth,
+                imageHeight
+            ))
+            counter = counter + 1
+        end
+
+        self.Count = counter
+
+        return self
+    end
+
+    self.image = newImage(path, alphaColor)
+
+    -- Generate slices
+    local imageWidth, imageHeight = self.image:getWidth(), self.image:getHeight()
+    local columns = math.floor(imageWidth / width)
+    local rows = math.floor(imageHeight / height)
+
+    local counter = 0
+    for x = 0, columns - 1 do
+        for y = 0, rows - 1 do
+            table.insert(self.sprites, love.graphics.newQuad(
+                x * width,
+                y * height,
+                width,
+                height,
+                imageWidth,
+                imageHeight
+            ))
+            counter = counter + 1
+        end
+    end
+
+    self.Count = counter
+
+    return self
+end
+
+function Spritesheet:Draw(slice, x, y)
+    local sprite = self.sprites[slice]
+    if sprite then
+        love.graphics.draw(self.image, sprite, x or 0, y or 0)
+    end
+end
+
+
+--[[
+    Sound Class
     This is essentially just a Wrapper for LÖVEs Source
 ]]--
 
-Audio = {}
-Audio.__index = Audio
+Sound = {}
+Sound.__index = Sound
 
-function Audio.new(path, soundType)
-    local self = setmetatable({}, Audio)
+function Sound.new(path, soundType)
+    local self = setmetatable({}, Sound)
 
     self.source = love.audio.newSource(path, soundType or "static")
 
     return self
 end
 
-function Audio:Play()
+function Sound:Play()
     self.source:play()
 end
 
-function Audio:Stop()
+function Sound:Stop()
     self.source:stop()
 end
 
-function Audio:Pause()
+function Sound:Pause()
     self.source:pause()
 end
 
-function Audio:Resume()
+function Sound:Resume()
     self.source:play()
 end
 
-function Audio:SetLooping(bool)
+function Sound:SetLooping(bool)
     self.source:setLooping(bool)
 end
 
-function Audio:SetVolume(volume)
+function Sound:SetVolume(volume)
     self.source:setVolume(volume)
-end
+end
+
+
+--[[
+    Color Class
+    A convenient Color class that works with any love2D function
+]]--
+
+function Color(r, g, b, a)
+    r = (r or 255) / 255
+    g = (g or 255) / 255
+    b = (b or 255) / 255
+    a = (a or 255) / 255
+
+    local color = {
+        r = r, g = g, b = b, a = a,
+        [1] = r, [2] = g, [3] = b, [4] = a -- love2D expects a sequential array, so heres the fix for that
+    }
+
+    -- Return it as a class, that way we can use it freely anywhere we wish
+    return setmetatable(color, {
+        __index = function(tbl, key)
+            if key == 1 then return tbl.r
+            elseif key == 2 then return tbl.g
+            elseif key == 3 then return tbl.b
+            elseif key == 4 then return tbl.a
+            else return rawget(tbl, key)
+            end
+        end,
+        __tostring = function(tbl)
+            return tbl
+        end
+    })
+end